linux-kernel - Re: [PATCH AUTOSEL 5.15 17/23] fec: Restart PPS after link state change

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Message-ID: <0d6d1182-921e-1da2-b315-427f25228d12@prolan.hu>
Date:   Wed, 31 Aug 2022 15:03:40 +0200
From:   Csókás Bence <csokas.bence@...lan.hu>
To:     Sasha Levin <sashal@...nel.org>, <linux-kernel@...r.kernel.org>,
        <stable@...r.kernel.org>
CC:     "David S . Miller" <davem@...emloft.net>, <edumazet@...gle.com>,
        <kuba@...nel.org>, <pabeni@...hat.com>, <netdev@...r.kernel.org>
Subject: Re: [PATCH AUTOSEL 5.15 17/23] fec: Restart PPS after link state
 change


On 2022. 08. 30. 19:21, Sasha Levin wrote:
> From: Csókás Bence <csokas.bence@...lan.hu>
> 
> [ Upstream commit f79959220fa5fbda939592bf91c7a9ea90419040 ]
> 
> On link state change, the controller gets reset,
> causing PPS to drop out and the PHC to lose its
> time and calibration. So we restart it if needed,
> restoring calibration and time registers.

There is an ongoing investigation on netdev@ about a potential kernel 
panic on kernels newer than 5.12 with this patch applied. Please hold 
off on backporting to 5.15 until the bugfix is applied to upstream.